// yacysearchitem.java
// (C) 2007 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
// first published 28.08.2007 on http://yacy.net
//
// This is a part of YaCy, a peer-to-peer based web search engine
//
// $LastChangedDate$
// $LastChangedRevision$
// $LastChangedBy$
//
// LICENSE
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import java.util.AbstractMap;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Map;

import net.yacy.cora.document.analysis.Classification;
import net.yacy.cora.document.id.MultiProtocolURL;
import net.yacy.cora.lod.vocabulary.Tagging;
import net.yacy.cora.protocol.RequestHeader;
import net.yacy.cora.sorting.ScoreMap;
import net.yacy.document.LibraryProvider;
import net.yacy.kelondro.util.ISO639;
import net.yacy.peers.graphics.ProfilingGraph;
import net.yacy.search.EventTracker;
import net.yacy.search.Switchboard;
import net.yacy.search.query.QueryParams;
import net.yacy.search.query.SearchEvent;
import net.yacy.search.query.SearchEventCache;
import net.yacy.search.query.SearchEventType;
import net.yacy.server.serverObjects;
import net.yacy.server.serverSwitch;


public class yacysearchtrailer {

    private static final int MAX_TOPWORDS = 16;
    private static final int MAXLIMIT_NAV_LOW = 5;
    private static final int MAXLIMIT_NAV_HIGH = 20;

    public static serverObjects respond(final RequestHeader header, final serverObjects post, final serverSwitch env) {
        final serverObjects prop = new serverObjects();
        final Switchboard sb = (Switchboard) env;
        final String eventID = post.get("eventID", "");

        // find search event
        final SearchEvent theSearch = SearchEventCache.getEvent(eventID);
        if (theSearch == null) {
            // the event does not exist, show empty page
            return prop;
        }
        final RequestHeader.FileType fileType = header.fileType();

        // compose search navigation
        
        // namespace navigators
        String name;
        int count;
        Iterator<String> navigatorIterator;
        if (theSearch.namespaceNavigator == null || theSearch.namespaceNavigator.isEmpty()) {
            prop.put("nav-namespace", 0);
        } else {
            prop.put("nav-namespace", 1);
            navigatorIterator = theSearch.namespaceNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            while (i < 10 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next();
                count = theSearch.namespaceNavigator.get(name);
                if (count == 0) {
                    break;
                }
                nav = "inurl%3A" + name;
                if (!theSearch.query.modifier.toString().contains("inurl:"+name)) {
                    pos++;
                    prop.put("nav-namespace_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-namespace_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-namespace_element_" + i + "_on", 0);
                    prop.put(fileType, "nav-namespace_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                prop.put(fileType, "nav-namespace_element_" + i + "_name", name);
                prop.put(fileType, "nav-namespace_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-namespace_element_" + i + "_count", count);
                prop.put("nav-namespace_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-namespace_element", i);
            prop.put("nav-namespace_activate", on(pos, neg, MAXLIMIT_NAV_LOW) ? 1 : 0);
            i--;
            prop.put("nav-namespace_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-namespace", 0); // this navigation is not useful
            }
        }

        // host navigators
        final ScoreMap<String> hostNavigator = theSearch.hostNavigator;
        if (hostNavigator == null || hostNavigator.isEmpty()) {
            prop.put("nav-domains", 0);
        } else {
            prop.put("nav-domains", 1);
            navigatorIterator = hostNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            while (i < 20 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next();
                count = hostNavigator.get(name);
                if (count == 0) {
                    break;
                }
                nav = "site%3A" + name;
                if (theSearch.query.modifier.sitehost == null || !theSearch.query.modifier.sitehost.contains(name)) {
                    pos++;                    
                    prop.put("nav-domains_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-domains_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-domains_element_" + i + "_on", 0);
                    prop.put(fileType, "nav-domains_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                prop.put(fileType, "nav-domains_element_" + i + "_name", name);
                prop.put(fileType, "nav-domains_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-domains_element_" + i + "_count", count);
                prop.put("nav-domains_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-domains_element", i);
            prop.put("nav-domains_activate", on(pos, neg, MAXLIMIT_NAV_HIGH) ? 1 : 0);
            i--;
            prop.put("nav-domains_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-domains", 0); // this navigation is not useful
            }
        }

        // language navigators
        final ScoreMap<String> languageNavigator = theSearch.languageNavigator;
        if (languageNavigator == null || languageNavigator.isEmpty()) {
            prop.put("nav-languages", 0);
        } else {
            prop.put("nav-languages", 1);
            navigatorIterator = languageNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            while (i < 20 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next();
                count = languageNavigator.get(name);
                if (count == 0) {
                    break;
                }
                nav = "%2Flanguage%2F" + name;
                if (theSearch.query.modifier.language == null || !theSearch.query.modifier.language.contains(name)) {
                    pos++;
                    prop.put("nav-languages_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-languages_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-languages_element_" + i + "_on", 0);
                    prop.put(fileType, "nav-languages_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                String longname = ISO639.country(name);
                prop.put(fileType, "nav-languages_element_" + i + "_name", longname == null ? name : longname);
                prop.put(fileType, "nav-languages_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-languages_element_" + i + "_count", count);
                prop.put("nav-languages_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-languages_element", i);
            prop.put("nav-languages_activate", on(pos, neg, MAXLIMIT_NAV_HIGH) ? 1 : 0);
            i--;
            prop.put("nav-languages_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-languages", 0); // this navigation is not useful
            }
        }

        // author navigators
        if (theSearch.authorNavigator == null || theSearch.authorNavigator.isEmpty()) {
            prop.put("nav-authors", 0);
        } else {
            prop.put("nav-authors", 1);
            navigatorIterator = theSearch.authorNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            while (i < 20 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next().trim();
                count = theSearch.authorNavigator.get(name);
                if (count == 0) {
                    break;
                }
                nav = (name.indexOf(' ', 0) < 0) ? "author%3A" + name : "author%3A%28" + name.replace(" ", "+") + "%29";
                if (theSearch.query.modifier.author == null || !theSearch.query.modifier.author.contains(name)) {
                    pos++;
                    prop.put("nav-authors_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-authors_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-authors_element_" + i + "_on", 0);
                    prop.put(fileType, "nav-authors_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                prop.put(fileType, "nav-authors_element_" + i + "_name", name);
                prop.put(fileType, "nav-authors_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-authors_element_" + i + "_count", count);
                prop.put("nav-authors_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-authors_element", i);
            prop.put("nav-authors_activate", neg > 0 ? 1 : 0); // by default off
            i--;
            prop.put("nav-authors_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-authors", 0); // this navigation is not useful
            }
        }

        // topics navigator
        final ScoreMap<String> topicNavigator = sb.index.connectedRWI() ? theSearch.getTopicNavigator(MAX_TOPWORDS) : null;
        if (topicNavigator == null || topicNavigator.isEmpty()) {
            prop.put("nav-topics", "0");
        } else {
            prop.put("nav-topics", "1");
            navigatorIterator = topicNavigator.keys(false);
            int i = 0;
            // first sort the list to a form where the greatest element is in the middle
            LinkedList<Map.Entry<String, Integer>> cloud = new LinkedList<Map.Entry<String, Integer>>();
            while (i < MAX_TOPWORDS && navigatorIterator.hasNext()) {
                name = navigatorIterator.next();
                count = topicNavigator.get(name);
                if (count == 0) break;
                if (name == null) continue;
                Map.Entry<String, Integer> entry = new AbstractMap.SimpleEntry<String, Integer>(name, (count + MAX_TOPWORDS - i) / 2);
                if (cloud.size() % 2 == 0) cloud.addFirst(entry); else cloud.addLast(entry); // alternating add entry to first or last position.
                i++;
            }
            i= 0;
            for (Map.Entry<String, Integer> entry: cloud) {
                name = entry.getKey();
                count = entry.getValue();
                prop.put("nav-topics_element_" + i + "_on", 1);
                prop.put(fileType, "nav-topics_element_" + i + "_modifier", name);
                prop.put(fileType, "nav-topics_element_" + i + "_name", name);
                prop.put(fileType, "nav-topics_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, name).toString());
                prop.put("nav-topics_element_" + i + "_count", count);
                prop.put("nav-topics_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-topics_element", i);
            i--;
            prop.put("nav-topics_element_" + i + "_nl", 0);
        }

        // protocol navigators
        if (theSearch.protocolNavigator == null || theSearch.protocolNavigator.isEmpty()) {
            prop.put("nav-protocols", 0);
        } else {
            prop.put("nav-protocols", 1);
            navigatorIterator = theSearch.protocolNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            boolean visible = false;
            while (i < 20 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next().trim();
                count = theSearch.protocolNavigator.get(name);
                if (count == 0) {
                    break;
                }
                visible = visible || "ftp,smb".indexOf(name) >= 0;
                nav = "%2F" + name;
                if (theSearch.query.modifier.protocol == null || !theSearch.query.modifier.protocol.contains(name)) {
                    pos++;
                    prop.put("nav-protocols_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-protocols_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-protocols_element_" + i + "_on", 0);
                    prop.put(fileType, "nav-protocols_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                prop.put(fileType, "nav-protocols_element_" + i + "_name", name);
                prop.put(fileType, "nav-protocols_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-protocols_element_" + i + "_count", count);
                prop.put("nav-protocols_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-protocols_element", i);
            prop.put("nav-protocols_activate", neg > 0 || visible ? 1 : 0); // by default off
            i--;
            prop.put("nav-protocols_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-protocols", 0); // this navigation is not useful
            }
        }

        // filetype navigators
        if (theSearch.filetypeNavigator == null || theSearch.filetypeNavigator.isEmpty()) {
            prop.put("nav-filetypes", 0);
        } else {
            prop.put("nav-filetypes", 1);
            navigatorIterator = theSearch.filetypeNavigator.keys(false);
            int i = 0, pos = 0, neg = 0;
            String nav;
            boolean visible = false;
            while (i < 20 && navigatorIterator.hasNext()) {
                name = navigatorIterator.next().trim();
                count = theSearch.filetypeNavigator.get(name);
                if (count == 0) {
                    break;
                }
                visible = visible || Classification.isMediaExtension(name) || "pdf,doc,docx".indexOf(name) >= 0;
                nav = "filetype%3A" + name;
                if (theSearch.query.modifier.filetype == null || !theSearch.query.modifier.filetype.contains(name) ) {
                    pos++;
                    prop.put("nav-filetypes_element_" + i + "_on", 1);
                    prop.put(fileType, "nav-filetypes_element_" + i + "_modifier", nav);
                } else {
                    neg++;                    
                    prop.put("nav-filetypes_element_" + i + "_on", 0);                    
                    prop.put(fileType, "nav-filetypes_element_" + i + "_modifier", "-" + nav);
                    nav="";
                }
                prop.put(fileType, "nav-filetypes_element_" + i + "_name", name);
                prop.put(fileType, "nav-filetypes_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                prop.put("nav-filetypes_element_" + i + "_count", count);
                prop.put("nav-filetypes_element_" + i + "_nl", 1);
                i++;
            }
            prop.put("nav-filetypes_element", i);
            prop.put("nav-filetypes_activate", neg > 0 || visible ? 1 : 0); // by default off
            i--;
            prop.put("nav-filetypes_element_" + i + "_nl", 0);
            if (pos == 1 && neg == 0)
             {
                prop.put("nav-filetypes", 0); // this navigation is not useful
            }
        }

        // vocabulary navigators
        final Map<String, ScoreMap<String>> vocabularyNavigators = theSearch.vocabularyNavigator;
        if (vocabularyNavigators != null && !vocabularyNavigators.isEmpty()) {
            int navvoccount = 0;
            vocnav: for (Map.Entry<String, ScoreMap<String>> ve: vocabularyNavigators.entrySet()) {
                String navname = ve.getKey();
                if (ve.getValue() == null || ve.getValue().isEmpty()) {
                    continue vocnav;
                }
                prop.put(fileType, "nav-vocabulary_" + navvoccount + "_navname", navname);
                navigatorIterator = ve.getValue().keys(false);
                int i = 0;
                String nav;
                while (i < 20 && navigatorIterator.hasNext()) {
                    name = navigatorIterator.next();
                    count = ve.getValue().get(name);
                    if (count == 0) {
                        break;
                    }
                    nav = "%2Fvocabulary%2F" + navname + "%2F" + MultiProtocolURL.escape(Tagging.encodePrintname(name)).toString();
                    if (!theSearch.query.modifier.toString().contains("/vocabulary/"+navname+"/"+name)) {
                        prop.put("nav-vocabulary_" + navvoccount + "_element_" + i + "_on", 1);
                        prop.put(fileType, "nav-vocabulary_" + navvoccount + "_element_" + i + "_modifier", nav);
                    } else {
                        prop.put("nav-vocabulary_" + navvoccount + "_element_" + i + "_on", 0);
                        prop.put(fileType, "nav-vocabulary_" + navvoccount + "_element_" + i + "_modifier", "-" + nav);
                        nav="";
                    }
                    prop.put(fileType, "nav-vocabulary_" + navvoccount + "_element_" + i + "_name", name);
                    prop.put(fileType, "nav-vocabulary_" + navvoccount + "_element_" + i + "_url", QueryParams.navurl(fileType.name().toLowerCase(), 0, theSearch.query, nav).toString());
                    prop.put("nav-vocabulary_" + navvoccount + "_element_" + i + "_count", count);
                    prop.put("nav-vocabulary_" + navvoccount + "_element_" + i + "_nl", 1);
                    i++;
                }
                prop.put("nav-vocabulary_" + navvoccount + "_element", i);
                i--;
                prop.put("nav-vocabulary_" + navvoccount + "_element_" + i + "_nl", 0);
                navvoccount++;
            }
            prop.put("nav-vocabulary", navvoccount);
        } else {
            prop.put("nav-vocabulary", 0);
        }

        // about box
        final String aboutBody = env.getConfig("about.body", "");
        final String aboutHeadline = env.getConfig("about.headline", "");
        if ((aboutBody.isEmpty() && aboutHeadline.isEmpty()) || theSearch.getResultCount() == 0) {
            prop.put("nav-about", 0);
        } else {
            prop.put("nav-about", 1);
            prop.put("nav-about_headline", aboutHeadline);
            prop.put("nav-about_body", aboutBody);
        }

        // category: location search
        // show only if there is a location database present and if there had been any search results
        if ((LibraryProvider.geoLoc.isEmpty() || theSearch.getResultCount() == 0) &&
            (theSearch.locationNavigator == null || theSearch.locationNavigator.isEmpty())) {
            prop.put("cat-location", 0);
        } else {
            prop.put("cat-location", 1);
            final String query = theSearch.query.getQueryGoal().getQueryString(false);
            prop.put(fileType, "cat-location_query", query);
            final String queryenc = theSearch.query.getQueryGoal().getQueryString(true).replace(' ', '+');
            prop.put(fileType, "cat-location_queryenc", queryenc);
        }
        prop.put("num-results_totalcount", theSearch.getResultCount());
        EventTracker.update(EventTracker.EClass.SEARCH, new ProfilingGraph.EventSearch(theSearch.query.id(true), SearchEventType.FINALIZATION, "bottomline", 0, 0), false);
        return prop;
    }

    private static final boolean on(final int pos, final int neg, final int maxlimit) {
        return neg > 0 || (pos > 1 && pos <= maxlimit);
    }

}
//http://localhost:8090/yacysearch.html?query=java+&amp;maximumRecords=10&amp;resource=local&amp;verify=cacheonly&amp;nav=hosts,authors,namespace,topics,filetype,protocol&amp;urlmaskfilter=ftp://.*&amp;prefermaskfilter=&amp;cat=href&amp;constraint=&amp;contentdom=text&amp;former=java+%2Fftp&amp;startRecord=0
//http://localhost:8090/yacysearch.html?query=java+&amp;maximumRecords=10&amp;resource=local&amp;verify=cacheonly&amp;nav=hosts,authors,namespace,topics,filetype,protocol&amp;urlmaskfilter=.*&amp;prefermaskfilter=&amp;cat=href&amp;constraint=&amp;contentdom=text&amp;former=java+%2Fvocabulary%2FGewerke%2FTore&amp;startRecord=0